Hi S.,
I highly recommend "On Becoming Babywise" by Gary Ezzo. He covers both of these issues in an easy to understand way (even for sleep-deprived new moms! =)
The gist of the book is this. You need to get the baby onto an acceptable eat-wake-sleep schedule. For instance, if his first feeding is at 6am, he would stay awake until 8:30 or 9am, and then you would put him down, drowsy but still awake, in his crib. He sleeps until 10am, when he wakes up hungry and you feed him a big, full meal. Then he stays awake until noon, when he takes another nap until 2ish. He wakes up hungry, you feed him a big, full meal, and the cycle continues. But here's the thing! Put him down SUPER EARLY for the night - like 6-6:30pm! (Sounds crazy, but totally works.) Again, he should be awake but drowsy. If he fusses a bit as he is falling asleep, that's ok and normal. This is not the same as "crying it out" but rather just the baby getting rid of some stress and settling himself down in order to sleep. Also, if he wakes up at night, that's ok too. Unless he is absolutely wailing, leave him be. He may fall back asleep on his own. Sometimes babies aren't actually awake - they do fuss in a half-awake state sometimes, and can fall back asleep if you leave them alone. The trick is, watch the clock for 5 minutes. It will seem like a long time but you'll be surprised, he may fall back asleep in that time.
Part of your breastfeeding issues might be that you're trying to feed him too often. I know that sounds weird because all the baby classes and books try to tell you to pick up the baby every time they fuss, feed them whenever they cry, etc, but in my experience that didn't work very well. Scheduling the feedings led to more successful feedings - I found my babies would eat more and be happier about it if they were HUNGRY when I fed them. If I fed them every time they cried, they'd "snack" for 5 minutes and then cry, because of course the problem was not hunger. And then because they'd snacked, they wouldn't eat a full meal, and would only get the watery foremilk, which isn't filling for them, which would cause them to wake up mid-nap, and be cranky, and on and on.
I know that's just a brief overview, but if it sounds like those are your issues, then I would highly recommend the BabyWise book. It's a very quick read, and it absolutely saved me when I was a new mom!
And about the breastfeeding... look, if it's not working for you, there is no harm at all in bottle feeding. Or, pump and give him breastmilk in a bottle. I have a cousin who did that when her son was a baby for the same reasons as you - her son had been in the NICU. He's now perfectly healthy and 9 years old! Don't feel guilty about it - the important thing is that you're holding him and feeding him. It doesn't matter if it comes from bottle or breast.
Hang in there, mama, you're doing a great job!